Parents Visa: Need invitation letters from both children in USA?

[spam]

Hi,

My parents are going for interview soon. I am inviting and sponsoring them. My sister/brother-in-law live in East coast.

Do they need invitation letter from my sis as well?

I have mentioned in my invitation letter that I will take them to visit sis in east coast (I am in CA). In the covering letter parents mention that they will need 6 months visa as they need to visit their daughter and tour east coast. Again, I am sponsoring and giving them I-134 for all the expenses..


Appreciate your inputs..

[taco]

no need. But they should carry copies of passports and visas for all the
children in the US.