After doing bharasamarpanam, for the benefit of the family can atonements such as griha shanti, sarpa shanti, etc. be performed?

It is not a practice to perform shanti homams after doing bharasamarpanam. Bharasamarpanam means that we have submitted the soul/atmA unto Emperuman. So, need to perform atonements like griha shanti and sarpa shanti. One can chant Perumal’s Sahasranamam.