If you can, you'd better not separate. It doesn't mean that you should take good care of your parents, nor does it mean that you have enough material resources. Separation will bring some shadows to parents more or less. Old people are old, I hope their children can give them some emotional comfort and enjoy family happiness with their children. If the conditions are really limited and we have to separate, we can consider letting the elderly live downstairs because it is inconvenient for the elderly to get up and down.
There is no taboo, the real taboo is unfilial children. Children e have filial piety, even if they are not considerate in some aspects, parents will understand!