Bouts of depression last weeks at best , often months on end ...never ever 6 hours .
Think your dad is ver maniplative and your mum i s doing her best to cover for him.
People who are severely ill with MH , often deny that anything is wrong with them , which is probably why they get so ill in the first place.
I dont think you dad just has OCD . He has behaviours that are not just OCD ,but perhaps ocd with something else wrong too. (Inapropriate behaviours ,sulking tantrums)
OCD is anxianty based , and often has intrusive thoughts , (like something bad wil happen if x isnt done 6 time in a row, of course im simplifing it at lot here).
IF your dad gets agitated and shouts and slams doors if he cant complete his rituals , the you could say its the ocd. IF he shouts and slams door because he isnt getting his own way (outside ritualism) then it isnt.
Very very difficult to live with .
Speaking as someone with Ocd , id say watch his behaviours , look for a trigger for the ocd. Not everyones is obvious , but it should be there. It will cause anxiaty each and every time which in turn causes the ocd behaviour to surface more.(which causes more anxiety
).
If there is no pattern to it , id be
.
when was your dad dx?