Does the racial bonus from these two traits stack (for a total of +12 if a race has both)? Also is the Take 10 while swimming exclusive to the Water Child or do races Swim trait also get it?
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Water Child (4 RP): Members of this race gain a +4 racial bonus on Swim checks, can always take 10 while swimming, and may choose Aquan as a bonus language.
Swim (2 RP): Prerequisites: None; Benefit: Members of this race have a swim speed of 30 feet and gain the +8 racial bonus on Swim checks that a swim speed normally grants.
Racial bonus doesn't stack with racial bonus unless specified. And creatures with a swim speed can take 10.
Water Child is completely, ridiculously overpriced at 4 RP.
I think racial bonuses do stack