Letter offering to stay with a child

Dear Kevin and Samantha

I want to thank you for letting us know about your recent adoption of baby Kim. Jeff and I are very happy for the three of you.

Jeff and I would like to offer our services to you as amateur babysitters should the two of you ever need us. We would be more than willing to have both Kim and Shannon stay with us while the two of you spend time to celebrate. It would be good training for us as we are planning to have our own family soon.