ITA with all above. I am also aware that we ask advice from people whose opinions we want to hear.
So although in principle, the "guiding to solutions" & "parenting groups" are excellent advice, I think DiL wants your take.
You obviously have at least 2 sons, so I think she wants to hear tales of their childhood, and how you coped with their rivalry.
I also assume that she thinks fairly highly of at least one of your sons (!) so may want the reassurance that her son will grow up OK.
You can share your own experience & ideas, whilst recognising that their family circumstances are different, and that she may find things difficult that you found easy (and vice-versa).
A useful question is to ask what she would like to be different / do differently and then ask how you can help with that.
Well Labour’s “patriotism” didn’t last very long, did it? 🇬🇧
Angela Rayner lashes out and calls Sunak “pint sized loser”.