I want to use Php+mysql to design a family tree Web site, the challenges encountered

I want to use Php+mysql to design a family tree website, encounter the puzzle
Problem
1: How to design the family tree data table, is the Member User table (UID name sex Fatherid) and relationship (UID Motherid fatherid) relational table separate, or a table?
2. How to remove the UID of the family tree from the parent-child node of the father and mother brothers??
------to solve the idea----------------------
Personal table: Save as name, date of birth, main deeds, etc. only personal records, establish a unique ID of key
Relational tables: Create a relationship table with a personal ID that is used primarily to record data between individuals
The above for reference

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