A. As per the law of succession, when a male Hindu died intestate (without will) that the property will devolve upon class I legal heirs equally, i.e, wife, children and mother.
B. On what basis you are coming to conclusion over the property nature is ancestral property. There must be four generation and property would have to be passed without interruption.
C. As per the latest SC Judgement, daughters cannot claim equal share over ancestral property as coparcenars if father died before 2005.
D. Your husband can file a partition suit before the court by mentioning property details being class i legal heirs even if you don't have any legal documents in respect of your property. However, it is easy to get if you have property details.
E. Finally, your husband have a good case to claim his respective share without any legal dispute. Moreover, it is immaterial thing regarding whether the property nature is ancestral or self acquired in your case from the point of your husband share to claim equal share.