Yes, you can. Be sure to detail how your disability affects your everyday life.
I have dissociative identity disorder. It does not affect my ability to study as one identity state in particular, with two others to assist, is geared towards study & talented in this particular area. However, getting her to eat/cook doesn't happen easily as she's also the perfectionist who drove our anorexia. So, I can be working, but then I won't be able to fulfill the 'can independently cook & eat a meal' because I won't be around to manage that, and she won't do it without external prompting.
I can look after my child because that is my identity state's purpose. But when I'm not doing that, I dissociate, so I can't do much independently. We also have child states that can't be trusted to take care of themselves (would you trust a four year old to cook their own dinner, get a bus or train on their own?) So if DD is not around, and adult parts dissociate, it pushes us into needing extra care, or just making do until an adult part switches back in. So, if DD is in bed 6pm, I might only wake back up when she does at 7am, meaning I will have not had dinner because the 4yo part played with Lego til bedtime.
It's fucking complicated to get the support but it's a fucking complicated condition. I wouldn't get it if I wrote down what's outwardly visible- that I can study, manage a house, and raise my DD. But what's not noticed is the effort and extra expenses caused; negotiating bribes with a 12yo to have her clean the house while DD is at nursery, making sure the 4yo has enough time put aside in the evenings that she will be quiet all day, making sure I schedule mealtimes around the anorexic part's time so she doesn't have to freak out... And ofc it takes unnecessary amounts of time to negotiate what we are wearing each day, not to mention maintaining several wardrobes of clothes to everyone's tastes.
All of those score points for PIP. Does his condition affect him on a daily basis similarly? Certain things are made impossible, extremely difficult, or take forever to do because of his condition and he needs to set up complex workarounds?