Our helper of 2 1/2 years is leaving our employment and I need to start preparing my 3 1/2 yr old. He's pretty close to her. He's quite used to relatives, friends coming and going and he doesn't get too upset when they disappear but this will be different I think. On the upside, her replacement is someone he already knows well and is quite happy with--and she'll be with us when the other one leaves. Anyone dealt with this with a young child? Any tips?