H4 extension

Hi,I have a H1 valid till July end 2018. And right now I am in US. My company is initiating my extension. My family are in my country and will be travelling in May end as dependent. Can I initiate their dependent H4 as well? Will it affect their travel?

Can I initiate their dependent H4 as well?

Ans: Yes

Will it affect their travel?

Ans: No