If it were me, to keep the peace, I would enrol my child in infant care. If I insist on leaving my baby with my dad, then I'd risk getting my step-mom upset and that would cause problems between them in the long run. I don't want them arguing over my baby. At least at infant care, I know that I am leaving my child in the care of professionals and there are other people there, as opposed to leaving baby alone at home with just a helper. Thus, even though it's not my first choice, I'd go for infant care.
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