Positive law Puns

So we were sitting at at the table having hotdogs for dinner. My mother-in-law and I then both went to ask my daughter for something at the same time, me for the sauce and the MIL for my daughters glasses so she can clean them. Then we ended up taking turns asking

My MIL then commented that it was good that we didn't ask at the same time otherwise she would be cleaning the bottle and I would be trying to put glasses on the hot dog.

My wife then turned to me and said "Then it would be a Seeing Eye Dog!" And promptly burst out laughing.

This was made all the more special, since my wife is only now just coming out of a 5 year melancholic depression. Yay!

EDIT: Changed wording to make it clearer. Thank you very much from both myself and my wife for all your positive thoughts. :)

This was the scenario more or less.

Sister-in-law: I just took two pregnancy tests and they both came out positive!

Brother: That's incredible!

Sister-in-law: I think we should go to a baby doctor as soon as possible.

Brother: I would feel a lot more comfortable if the doctor was an adult.

So my sister is pregnant and very pessimistic from being very pregnant. They're discussing blood types at the dinner table and I walk in mid conversation.

Bro-in-law: "You are A negative, and I am trying to B positive."

My sister started crying, I think because the joke was so bad.