Yes, this will put you in a much better position.Thanks @TanakaM for clearing my doubts. Much appreciated. so i will follow below steps.
1. Transfer required amount of money from the joint account into my personal account.
2. get a notarized affidavit from my mother in law and Husband regarding this transaction.
3. share all the information regarding joint account in LOE and attach bank statements of both my account and the joint account.
Thanks once again
All the best