Why is marriage forbidden with two sisters at same time

What nation is this, is it a relgious law or a civil law you are talking about ?

Since I am in the US, any marriage to two people at the same time is illegal.

Keeping one female happy is expensive enough, but two..?

sarttaj does not find this helpful : because I asked dr zakir to answer..

So where is the "dear Dr. Zakir" in your post? No body here by that name so you must be on the wrong site.