When someone complains to you about the same thing over and over, do you offer them unsolicited advice?

A good friend of mine has her adult son (22 years old) living with them, which, in this economy, is not unusual. The son doesn’t work, demands money, the parents give him gas money, pay for car, phone, send him on vacation, he has friends over and it’s a big party, etc. I was there once when he demanded gas money, and when she said no he called her a “f___ing c__t.” Every time I see her she tells me how he asked for money and she gave it to him and then gave him the “you have to get a job” speech, to which he agrees, yes, he will get a job asap.

Do I tell her my opinion or do I nod sympathetically?

My opinion is that as long as they’re going to pay for him, he’s going to continue his lifestyle, not work.