Driving downhill

I am in the car with my son. We are chatting and our conversation went from making me laugh to making me cry in about 6 blocks.

Son: Is that bird poop? (pointing at the window)

Me: Yes it is.

S: Can I touch it?

M: No.

S: Why not?

M: It has germs baby.

S: (As we drive past a dog out on a walk) Dogs can't poopy on the car.

M: No they can't.

S: No. It would make a big mess and they could fall off and get hurt.

M: They could fall off.

S: Then they'd have to go to the doggie hospital. I don't know where it is but Daddy does.

M: Really?

S: (After a pause) Is Papa still sick?

M: No, Papa isn't sick anymore.

S: Is he at Grandma's house?

M: No baby, he's in heaven.

S: Aww, but I miss him.

M: I miss him too baby.

Breaking my heart.