S.M.
I think it depends on what's happening with the relative and who's idea it is. If this is a Grandmother and she really wants this, then I would offer her 1/2 of the going rate. BUT, that's only if they are already retired. If it's a stay at home Aunt that already has their finances in order, and it's HER idea, then I would also offer 1/2 the going rate. BUT, if this person has to revise their own schedule to help you, or may be turning away a job because of it, or it's NOT their idea, then offer them the same you would anyone else. I would suggest between 15 and 25 per day.