I have one. A belt and braces job that was drafted "in comteplation of marriage" to my DH and pre-DS.
I keep telling both my DH and DParents to sort out a will.
DH is married to me (obv) and we own a home together - both names on deed and mortgage. He has things like his car in his name, as have I. We have DS.
DParents aren't married. DM has her maiden name. They rent a property and other than furniture etc own very little.
In the above cases, what would happen id DH died before me or after me.
Also, what about my parents?