Regarding property sold

A became owner of property in April 1996 died 14.01.2018 living behind Legal heir wife Two Son Or a daughter. Both Son and One daughter Relinquishment deed write in favour of mother on 30.01.2018 therefore mother become sold and absolute owner of the property. Mother sold the property on 10.09.2020. Question is:- whether it is a long term capital gain or short term capital gain?