Phone call from mother
Your cousin is raising money for xx charity (local not widely known and imo a little bit dubious as its fundraising for someone medical treatment) please transfer her £100
Oh and send your uncle a birthday card and present.
Now several years ago I raised over £10k for Macmillan and had zero support from my mothers family, it was for my holiday apparently (I paid the costs associated with the trip myself) I am very much tempted to tell her where to go and that I will make a donation to a mainstream charity instead. AIBU? Also £100 is a lot of money that I can't really afford at the moment and said uncle tends to leave the room if I am there.