If I have a sister- in- law that get married will her husband consider my brother- in-law
That all depends. If she's you're sister-in-law because she's your husbands sister, no. If she's your sister-in-law because she's married to another of your brothers, yes.
Yes I think
I don't think so. Since she not related by blood her husband would have no relation to you but friends.
If I understand right, you are asking if your husband's sister's husband is your brother-in-law, Yes.