I don't like to co sleep with my kids because I can never settle properly with them near me, they steal the doona, and DH has to move into the middle of the bed to accommodate them so I have less room. We do take them in if they are really unsettled but in general as the child comes into our bed I sneak off into their recently vacated bed. Perhaps your DF having somewhere else to go to sleep would help solve the problem of him not liking co-sleeping?