how do you divide the shares on a home with multiple joint tenancy quitclaim deeds?

My Mom owned here home (no mortage) and put my name on the property with a quitclaim deed (joint tenancy) roughly 15 years ago. Shortly before she died in 2013 she filed another quitclaim deed (joint tenancy) with a third party. Quitclaim Deed Joint Tenancy 1 (My Name, My Mother's Name) Quitclaim Deed Joint Tenancy 2 (My Mother's name, Third Party) What % share am I entitled to upon the sale of the house? Wording from Quitclaim Deed, both deeds have the same wording, with the only difference being the parties involved: "the grantor, for and in consideration of the sum of $10, the receipt and sufficiency of which is herby acknowledged, has remised, released, sold and QUITCLAIMED, and by these presents does remise, release, sell and QUITCLAIM unto the grantees, their heirs, successors and assigns forever, not in tenancy in common but in joint tenancy, all the rights, title, interest, claim and demand which the grantor has in and to the real property, together with improvements."