The answer to this is A. The related list option is going to be very useful for this and for finding other related information about the child. There are some people who do not understand how to use Salesforce the first time that they have tried it but the more that they look into it, the more that they understand how easy it can be used especially when searching for some of the information that you might need.
You will not have any regrets when you try to learn more details about it. Aside from the related list, there are other buttons and options that can provide you with the data that you want to get.