just remind u,

be careful when talking with them. You need to be professional instead of being emotional (like to use 真 心), unless you know that family very well. Your words with them can be easily used in a wrong way to be against you in future. Based on my experience, many times, the people use 真 心 at end will lose. (I know many people here may not agree with me). Check you insurance policy. The bottom line is that you should be responsible for your part, which should not be defined by the other family.

Just my 2 cents