question for a friend

good afternoon ive got a friend who is one esa shes in the support group.  and shes also on pip. her husband works part time he only does 16 hrs so the dwp allow him carer allowance for looking after her.
the question is because her husband is self employed will he be allowed to apply for the self employed grant they are offering even though she is on esa pip.
ive said i didnt think so and its only universal credit claimants is that right can some one give some advice. i would hate him to apply for it and her get in trouble cus her claims in her name