In Pennsylvania, a 'joint tenancy with right of survivorship' requires which four unities at creation?

Explanation

Joint tenancy in Pennsylvania requires four unities at the time of creation: unity of possession (each tenant has equal right to possess the whole property), unity of interest (equal ownership interests), unity of title (acquired by the same deed), and unity of time (interests acquired at the same time). Upon the death of one joint tenant, the surviving tenant(s) automatically inherit the decedent's interest without probate. Pennsylvania courts require clear intent to create joint tenancy expressed in the deed.