K 1 form 1065

If you inherited a partnership (LP) (Domestic Partner)
type of entity -(individual) upon your mothers death

The partnership is a Seniors citizens home and was sold. Do u have to pay tax on this money since it was inherited from the mother? someone said there is a one million exemption before you have to pay taxes on it is that true? Or is the gain taxable? What forms to use if taxable? Thanks!