it's not easy o. Your husband may love you and know that your siblings have no choice. That is the main reason why he will tolerate that. Not many men will like that.

I sympatize with you. Every newly wed will want to live alone with her husband but kids that young (12yrs) need a home and a mother figure if not they will misbehave or grow without home training.

since your husband is not complaining, endure and let them stay with you. It is only a matter of time and they will all enter the university.

I pray they get good jobs so they can repay you and your husband for your kindness in future