Thickening of the womb lining

My daughter has just had a Transvaginal ultrasound which showed thickening of the womb lining and has been referred to hospital for a urgent appointment for a biopsy we have just found out after doctor had made referral that her gran (from her fathers side )and grans sister had womb cancer when they were in their early 30s same age as my daughter can this sort of cancer be genetic