English questoin, Which one is correct?

My family is going to the U.S tomorrow .

The first one is correct. The reason being that the word, "family" is a singular noun and the verb has to agree with the subject. Even if the family consists of 15 or more people, the word itself is singular. I hope this helps.

My family is going to the U.S tomorrow.

my family is going to the US tomorrow is the correct one because here the family is singular so "is" is appropriate then are.

my family is going to the US tomorrow.

my brother and sister are going to the US tomorrow.

i had to make up a new sentence fo the second one. i hope that helps. :)

My family IS going to the US tomorrow.

IS refers to ONE FAMILY

ARE is used to conjoin plurals, such as: Our families ARE going to the US tomorrow.

I don't know how to explain it better, I established good grammar at a very young age, but don't remember all of the proper explanations for all of the rules.

My family is going to the US tomorrow

there is only one family
a few families are going.................
Have a fun trip

My family is going to the US tomorrow; just sounds right.

"My family is" is correct, as "family" is a singular noun (even though it refers to a group of people). That said, I hear a lot of people saying "my family are" in informal, spoken English.

My family is going to the US tomorrow.
Are sounds more appropriate with "they" not "my". Saying "my family are" sounds a bit awkward.