Create a family with 20 children. They can be biological, adopted, or a mixture of both. Parents can be heterosexual or same sex couples, or you can have a single parent. Feel free to give the children families of their own and add pets if you'd like too. Number of little ones each child brings into the family is your choice.
To determine each child's gender, roll 2 dice. https://www.random.org/dice/?num=2 Odd = boy, even = girl. Twins, triplets, and other multiples are allowed. All ages are your choice.
Choose everyone's names using the dice to determine the theme of each name (roll twice for each person, once for the FNs and again for the MNs):
1-2: Classic/Vintage
3-4: Trendy (base it on the person's age)
5-6: Unusual/Rare
7-8: Nature
9-10: Literary
11-12: Mythological (Greek, Norse, Roman, etc...Your choice)
LN: Your choice