Toilet training twins - one ready, one not but the one who's not insists he is!

[4Marmalade]

So frustrated right now.  My twins are 32 months old.  Dd has been consistently peeing on the toilet for the last 2 weeks.  She even woke me up to pee in the middle of the night last night.  She did poop once on the toilet at the beginning but hasn't since.  Ds insists on wearing underwear right alongside dd.  He is not ready.  He might sit on the toilet which is great but he has never peed or pooped.  He doesn't really realize what has happened until afterwards.  So, basically I am cleaning up his pee/poop all day along with dd's poops (which is OK because I think she is very close).  Unless he decides to clean it up himself which has happened more than once .  He will not put on a diaper and throws a big fit if I try.  Am I destined to be cleaning up after him until he gets it?.  Should I just be forcing the diaper on him and telling him he's not ready yet but will be soon?