DP - while in many ways you are the perfect partner, your occasional complete thoughtlessness sometimes makes me want to scream. And no, I have not forgotten about that time when you mortified me in front of all my friends when I was 7 months pregnant with DD2, nor will I, so if on the odd occasion it gets brought up do not tell me to forget about it. Oh, and while you're there, 8 years and 2 kids - still not enough to get off your arse and ask me to marry you huh?
DBIL - I know you have depression, and I'm sorry you are so low at the moment. I also know I'm not a qualified counsellor. I'm sorry I do not have all the answers. I have advised you to talk to your GP and get some help, but that's all I can do. Please, I have no problem in talking to you, but I can't solve your problems for you.
MIL - no, I'm not going to stop breastfeeding because you are uncomfortable with it. And, if you offer to look after the kids, please could you make sure you actually do the basic things they need, like put them down for a nap (just because DD1 is running around doesn't mean she doesn't need a break) and feeding them proper food (crisps and biscuits are not a substitute for lunch when DD1 won't eat her sandwich, and a bottle of EBM is not in any way gross, so bloody well give it to DD2 when she's hungry).
Wow. This is cathartic!