Vaccinations

Sarah • Jake😍 momma to 2 sweet boys + a bonus momma to a beautiful girl photographer

My step daughter will be 3 in October. My son is due in the end of October. My step daughter was just vaccinated due to her mom being scared and wanting to wait. But she also has another child who is 8 months and I do not think he is vaccinated.

My question here is is it safe for my son to be around his sister if she has another brother who is vaccinated and she is around him half the time?