"I get up at 8a.m everyday while my dad gets up at 9a.m. I go to work at 10a.m , my dad doesn't go to work because he is the C.E.O. I get back from work at 7p.m and go to bed at 8p.m , my dad goes to bed at 10p.m because he needs to sign few documents."
First sentence: The predicate (main verb) is "gets up", which is third person singular. Who gets up? ="dad" is a noun used as a subject, and it is third person singular. The subject and verb in this sentence agree.
Second sentece: The predicate (main verb) is "doesn't go", which is third person singular. Who doesn't go? "dad" is a noun used as a subject, and it is third person singular. The subject and verb in this sentence agree.
Third sentence: the predicate (main verb) is "goes" which is third person singular. Who goes? "dad" is a noun used as a subject, and it is third person singular. The subject and verb in this sentence agree.