I'm not sure if IAMBU.
A close relative of mine is due to have a baby right at the end of the year. DH and I live very near them and their new partner and we have two young DC. Not sure if it's relevant but people have been very generous with us with our kids, we were in a bad financial position when we had our first, we got lots of gifts from family and friends and continue to receive lots of hand me down clothes for the kids from another relative on DH's side, and from friends. We are so grateful for all of this and definitely appreciate how lucky we are.
We are undecided about whether to have a third DC or not, DH wants to but I'm undecided for various reasons (although mainly the financial side of things). We've kept my maternity clothes, the baby stuff etc in the loft as we did after DC1 until we make a decision either way.
Pregnant relative has asked me if they can have baby things off us. Another relative has asked me twice if pregnant relative can have X and y off us, and they've also asked DH if they can z off us. I have some things I was going to offer pregnant relative anyway, nearer the time as they're not due for ages! Things we didn't use with DC2 and wouldn't with a third - so when she asked I told her what she could have and she confirmed she'd like all of it. Which is fine.
I just feel it's really rude and cheeky to actually ask for things though?! And I don't know how best to say no? They clearly don't think we will be having any more kids, and I don't know whether to be upfront and explain that's why they can't have them or not, because I know they (and other relative) will immediately start a tirade of why that's a ridiculous idea and we shouldn't etc etc so don't really want to open us up to that either!