TWICE is formed by JYP Entertainment and has 9 members and coincidentally they are all sisters.
So may right...
They were just a simple living girls before but had a problem in their family. They decided to continue and show their talents then now, They are TWICE.
They all have good values even though their parents was not there to support them.
Blackpink was formed by YG Entertainment and their situation is like TWICE, all sisters and ad a problem in their family. They live a happy life and wanted to reach their dreams and they hit the goal!
But isn't that too coincidence that the have a broken family and has the same dreams and also each band are sisters/