It absolutely is.
Just on the not latching on, a couple of things you and Claire (it is Claire isn't it?) could try - swaddle him before his feed so that his arms aren't getting in the way - this works really well for me as sometimes when E is frustrated, she pushes away from the breast with her fists. Secondly, chances are that Claire's breast is engorged at night, especially if it has been a while since the last feed, so get her to hand express just a bit off before trying to latch your son on. If the breast is engorged, it's really difficult for them to latch on. Thirdly, if he's unsettled and screaming/crying, it's going to be pretty impossible for him to latch on. Try and settle him down first (that's where you're best as he'll smell Claire's milk and will just get more frustrated and it then gets even more difficult to latch on, much easier for you to settle him) - get him upright, pat his back and shush at the same time (shush pat is a baby whisperer technique, the theory being that a baby can't concentrate on more than two things, so the shushing and the patting doesn't leave any room for crying), let him suck on your finger (gets the suck reflex going). Once he is calm, try again. Lastly, tell Claire not to be afraid to kind of manhandle him. I sometimes have to be firm to get E on the breast. Hold his head firmly with one hand and the breast with the other and put his nose by her nipple. He should open his mouth quite wide - put him on when he does this and hold him there until he starts sucking. I hope this helps, but feel free to PM me if you need any more advice.