This letter connects with a sibling to share your concerns about a parent.
1234, Main Street
Boston, MA 02123
07 April, 2005
<Recipient Address Goes Here>
By now I'm sure you've noticed that <thing that's worrying you>. I'm afraid that it's really begun to worry me and I wanted to see if you had given any thought to this growing problem. I don't want to alarm <Mom/Dad>, but I really feel that the time has come for us to say or do something to help out.
Please write or call me as soon as possible and let me know what your thoughts are on this. I'm sure that if, together, we approach the problem in a positive and supportive manner, we can help <Mom/Dad> while at the same time putting our own minds at ease.
I look forward to hearing from you.
encl: <List of enclosed items goes here>