If the number of female adults was 50 more than the males, then there were 100+50 = <<100+50=150>>150 females.
The total number of adults is 150+100 = <<150+100=250>>250
The children were twice the total number of adults, thus 2*250 = <<2*250=500>>500
The total number of people at the family reunion is 500+250 = <<500+250=750>>750
#### 750