I am an only child.  Do you have siblings
Yes, I have 3 siblings, first degree relatives. 
It must be different than being an only child
YEs, only childs have no siblings. It must be boring. 
But have not a lot of presidents been only children
I have no clue but the president leads the worlds most expensive military. 
Yes for sure.  We do spend a lot of money on our military
Military things in Canada are expensive too and buying the F-35 has caused controversy. 
What is the F-35?  A plane?
It's the newest fifth-generation fighter that performs ground attack and air missions.