13 weeks, very short wake windows..normal or should I be worried?

Hi all! FTM to a 13 week old boy and freaking out trying to figure out this sleep thing. My little guy is still waking is still waking twice to feed overnight (midnight and 3-4) with an occasional 6am wake. Going to bed around 10p and usually been waking for the day between 8-9. That is fine and well but I am going back to work in 2 weeks and he still is a hardcore contact napper. He needs to be rocked to sleep and then I try bassinet and crib naps 1-2x a day but they last about 20 minutes of I’m lucky and then he is miserable because he didn’t sleep. He is not happy unless he sleeps closer to 2 hours and although he is still smiley, a large part of his wake window you can tell he is overtired and glossy eyed. My worry is that my mom will be watching both him and my 18 month niece and won’t be able to contact nap for 2 hours and I don’t want her to have to deal with a miserable baby all day. Any advice??