Responses

Tandem nursing is safe but you should always prioritize the new born first so they get colostrum and enough milk to gain weight and grow.
As for feeding your husband .. its technically okay as long as you santize the nipple after and make sure your supply is steady enough that your baby wont be underfed. (Husband shouldnt even need the milk jfc)
The content of the breast milk changes deoending on your baby's salivaaa so if someone else sucks on them, then the nutrients wont madr for the baby anymoreee.