Ladies PLEASE HELP!

Laura • Ethan Ashley born 20th September 2015 at 12.08am weighing 8lb 👶🏼
My nephew has chicken pox and my mother in law and partner keeps telling me to take my son round to get it his 18 months and I don't want him to get it 😭😭 I don't know if he should get it now or later everyone's telling me to do it now please help