As mentioned above, no will was made. Luckily the sisters had bank accounts in joint names so there is no problem with that.
Mother died 20 years ago.
Neither Doreen nor her recently deceased sister and deceased brothers ever married nor do they have any offspring
The property was purchased in the name of the mother and the deceased sister, I presume when the mother died it would then be the property of said sister
Many thanks for this - I will speak with my husband this evening and check that he has no further questions.