had my sister and her 3 dc's over for day yesterday, went to fairground - dp came along which was an unexpected and lovely gesture. he went on two rides with the kids and paid for them. i had already said i would give sis money for kids to spend as hadn't done their bdays, so i paid for some other rides also (but didn't go on any). he paid for their rides of his own accord, the boys (who are v polite) all thanked him as did my sister. it did not cross my mind to thank him - i did not ask him to do it, i thought it a very nice (if unnecessary) gesture, but did not anticipate that it would require my gratitude.
oh how wrong i was.
i think if you choose to do sthg like that, then the thanks of those you have paid for should be sufficient, you should not need rest of world to acknowledge your generosity, or you're doing it for wrong reasons. AIBU???