I have a son who is 21 and has come home for a while as he is in between jobs.
My DP the father of my 7yr old and 6yr old but not of my 21yr old thinks he should pay £80 per week. 21 yr olds dad is paying the £50 for him until he gets another job which looks likely to be next week as he has been offered something. DP just won't listen when I explain that £50 is enough when he only eats here 3 or 4 times a week and only stays 4 nights a week,staying with friends the rest of the time. I have explained to DP that my friends DD pays her only £25 per week and she is at home all the time. 21 yr old makes no mess, helps whenever asks and does some of the cooking.
DP says if I ask my RL friends they will tell me what I want to hear so I am turning to the mumsnet jury to put me in my place if need be. I work part time and do everything in the home.