DEAR ABBY: On a recent trip back East, my father reunited with his childhood sweetheart and is now seeking a divorce after 32 years of marriage to my mother. Apparently my father has never gotten over this woman and had pined away for her since the day he married my mother.

The trouble is, he feels the need to tell everyone (including friends, family, strangers and my new boyfriend) about his dilemma in complete detail. He goes on and on about how terrible my mother is, why he needs to leave her and be with this other woman, etc.

How can I approach my father on the subject of appropriateness? I would like to tell him to put a lid on it, but then he pouts because he feels I'm not "supporting" him. Have you any suggestions, Abby? He doesn't need to be airing our family laundry in such detail with each and every person he encounters. -– THROWN FOR A LOOP IN L.A.

DEAR THROWN FOR A LOOP: Tell him exactly what you have told me and don't mince any words, because you are absolutely right. Also, don't count on muzzling the old dog. He's trying to justify throwing away his marriage and abandoning the wife he "tolerated" for 32 years. And frankly, he's only making himself look bad.

DEAR ABBY: I have a beautiful, brilliant daughter who has graduated with three degrees and high honors, but she seems to have no common sense.

She was engaged to her high school boyfriend, whom we all loved, then ditched him to date his friend. She gave up several excellent jobs, always landing on her feet, dated several men we all disapproved of, almost married a physical abuser (who, thankfully, dumped her just before the wedding), traveled all over the U.S.A. and Europe, and returned to another wonderful job.

She now lives with a slob, 15 years younger than herself, with no future and no money. He looks like an unmade bed with long dirty hair. I am mystified about how she can possibly introduce this person to her co-workers or others, ignoring the embarrassment to all of us. What is going on here? We had a huge blowup, and she now refuses to speak to me. -– HER LOVING MOTHER

DEAR LOVING MOTHER: Your daughter appears to be experienced, accomplished and successful at almost everything she has attempted. Apparently she is happy with this man, so he must be doing something right.

If you are truly a loving mother, be less critical of what you perceive to be his shortcomings and concentrate on the fact that he makes your daughter happy. Although you are well-intentioned, this is a choice that only she should make –- and she has made it.

DEAR ABBY: The letter from the woman who was uncomfortable about using her father-in-law as her OB/GYN prompts this letter. "Uncomfortable" posed a question I often receive at the South Carolina Board of Medical Examiners from practicing physicians.

It would be unprofessional and unethical for the father-in-law of "Uncomfortable" to serve as her physician, according to the American Medical Association Council on Ethical and Judicial Affairs.

If her father-in-law treats her, his license could well be subject to disciplinary action by his state medical board, and if he does so against her will, it SHOULD be. The father-in-law has only one ethical alternative: Decline to treat "Uncomfortable." –- AARON J.KOZLOSKI, J.D., M.P.A., BOARD ADMINISTRATOR

DEAR AARON: If my prior column on the subject did not settle the question, I'm certain that your letter will put the matter to rest. Thank you for your expert opinion.

For an excellent guide to becoming a better conversationalist and a more attractive person, order "How to Be Popular." Send a business-size, self-addressed envelope, plus check or money order for $3.95 ($4.50 in Canada) to: Dear Abby Popularity Booklet, P.O. Box 447, Mount Morris, IL 61054-0447. (Postage is included.)

DEAR ABBY: Last March, my best friend, "Emma," and I opened a business together.

We had a falling out three weeks ago and haven't spoken since. She's very stubborn and can't admit when she's wrong. On a hunch, I called the 24-hour banking service for our business account. Lo and behold, the balance was zero. A week ago it held more than $200. I checked further. There have been four ATM transactions in the last two weeks –- all withdrawals. One was done at a store where business was more than likely done; however, the others were done at the supermarket.

Abby, we were best friends –- or so I thought. I feel Emma stole the money. She didn't let me know we owed people who had helped us get started, so of course I have to pay them back.

I am so angry and hurt I don't know what to do. Our friendship is over. I'm really going to miss that because Emma was like a sister to me. I don't know what to do from here -– take her to court, scream at her, tell the world or just let it go. Your thoughts, please. -– STEPPED ON AND USED IN N.J.

DEAR USED: Now that you have vented, call your former business partner and ask her to account for the money that was supposed to be in the business account. She MAY have had a legitimate reason for withdrawing the funds.

You did not indicate how much money you feel obligated to pay back to the individuals who helped the two of you start the business. Since it was a partnership, you should not be on the hook for more than 50 percent of it. Add to it the money that should have been left in the joint account. If it's more than you can comfortably afford to lose, by all means take her to small claims court. If not, consider this an expensive introductory course in business accounting and safeguarding your investment –- and write her off.

DEAR ABBY: My wife and I have been annoyed by something for some time. We have a few friends who visit us at least twice a week. They insist upon hugging at every greeting and goodbye. Whether at my house, in public or elsewhere -– hugs are expected.

Should we just grin and bear the excessive hugging? Or should we avoid the hug and address the issue with them? –- OVERHUGGED IN LONG BEACH, CALIF.

DEAR OVERHUGGED: Tell your friends, as kindly as possible, that not all people are equally demonstrative –- and that all the hugging they take for granted makes you uncomfortable. Assure them of your caring and friendship, and ask them to please understand. If they are true friends, they will.

DEAR ABBY: When writing thank-you notes, how do you deal with gifts from a group of people? Do you write an individual thank-you to each person who signed the card, or can you send a "group" thank-you? -– TRAECY IN CLACKAMAS, ORE.

DEAR TRAECY: Much depends upon how many people make up the "group." For example, if the group comprises approximately 25 to 30 or more people, one thank-you note would be sufficient.

To order "How to Write Letters for All Occasions," send a business-size, self-addressed envelope, plus check or money order for $3.95 ($4.50 in Canada) to: Dear Abby, Letter Booklet, P.O. Box 447, Mount Morris, IL 61054-0447. (Postage is included.)