1. Whether this will be considered as proof in the court?.
That day my husband agreed for mutual divorce and giving my son to my custody and without any financial benefit for me. But now he is not ready to give my son custody to me.
Th audio recording may not be admissible as primary evidence in court but it may help to corroborate your statement in the absence of any other substantial evidence.
If he is not agreeing for child custody to you, you may use this audio recording before court to prove his lose moral and character under which the child may not be nurtured properly or brought up with good spirit or good morale, in your child custody case after rejecting his mutual consent divorce case.
2. He has sold his site gift-deed by his brother without my consent and asking for my signature now to sign on the NO CONSENT AGREEMENT. If I file divorce case now, whether my son 3yrs old will be able to get share in this property or money?. Probably the purchaser still not released all the amount until they get my signature. How can I use this to get my divorce?
Neither you nor your son can legally claim a share or rights in his self acquired property.
You cannot do anything about it except file an injunction suit to obtain injunction against the sale for creating charge on the property for the maintenance case you would be filing later on.
3. My mother-in-law own a building it has 3 floors and 5 houses in that. Whether my son has any rights to get share in this property?
NO