Dealing with disbelief from family members about OSDD diagnosis

Hey I’m Syn I’m a pain holder mainly physical pain here’s somthing that’s been happening recently with the hosts family his brother still thinks hes faking having OSDD and we’ve been self diagnosed for a long time and it was not even 2 or 3 years into finding out the host was part of the system to be like woah I’m part of this omg there’s so many things that aren’t even human in here and yeah I don’t know what else to talk about