Don’t return the gold ornaments . Stridhan was your mother absolute property
2)
Section 15 lays down that when a Hindu female dies intestate leaving her stridhan, it would devolve upon the following categories of heirs according to the rules provided fn Section 16 of the Act:
Firstly, upon sons and daughters (including the children of a predeceased son or daughter) and husband;
3) in present case your father , you and your siblings would inherit the gold ornaments
4) since your mother did not execute any will your father can claim share in her stridhan