Our tradition with my husband's family is that we dont' buy gifts for every holiday or birthday. Instead every few years, we get together to splurge on a gift that someone really wants but really cant afford on their own or wouldn't buy for themselves (ie. sporting event tickets for all of us to go see a game). This year, my MIL asked me what her son wanted for his birthday. I recommended that we go 50/50 on getting him a home theater system that he's been eyeballing for some time. She ordered the gift with the premise that I was to give her a check when I saw her next. The next time I saw her (this past Sunday), I forgot to bring my checkbook and told her I would write her a check at my husband's birthday dinner (let's be clear that I have already set aside the money for this gift, and that I'm not trying to get out of pitching in my half). Her response was not to worry about it, that it's already been paid for and I don't owe her anything... If I try to give her a check, I know she'll refuse or she'll take the check but then never cash it... do I not do anything or use the money I've saved to buy another gift for my husband who's birthday is two days away? Opinions?