Anonymous

Yes

Anonymous

No, once you have said he is my father you cannot call him the father, you can say, he is very humorous, or my father is very humorous, same with your sisters.

Anonymous

Use, "My father is very funny." "My sisters are very funny."

Anonymous

Yes u may and more natural would be to say he is very humorous and they are very humorous

Anonymous

Yes, but it makes it seem like you're talking about the person with less respect. So, while you can use "The" that way, it's really disrespectful. It's almost robotic and there is a lack of emotion when you're speaking that way.