Can a wife whose husband has passed away, write a will for a real estate property that was purchased by the husband but originally registered in her name? Wife has no sources of income to purchase any property. They have 3 childern. Will all childern have equal rights if the wife passes away without writing any will?

Yes, since the Property is registered in the name of the wife.  Therefore, she can wtire a will for the said property nd if she doesn't write the and any untoward incident takes place than all the childern will have equal right in the property.

Regards,

Follow Mr.Rohit's suggestion