I can tell you on a positive note, I bought my baby at 3weeks of age from a great little mom & pop pet shop that specializes in only parrots. They cared sooo well for Marco, and I went on Sat/Sun to visit her for 4 months I didnt miss a chance to visit. They weened her and socialized her the best they could. They all loved her there. The transition from there to the house was easy peezy. (I was lucky)
However I will say this much on your young children, Marco was not cool at all with the children that would come into the pet shop. They liked to run and yell and she got very fearful. Also, Marco has completely bonded with me and will not allow my kids (much older) to hold her at all w/out biting them severly.
Marco is a TON of fun, but a ton of work as well. Read up on all the things offered here for sure before making your final decision. Greys are awesome and just like people everyone is different! I can only tell you the experiences I have had with my own baby!
Good luck to you!