Tom Riddle/Voldemort bloodline

[callie603]

No: HPFGUIDX 46768

Hello All,
This is my first post. I have checked the VFAQ, and can't find the 
answer to this disturbing thought. Please let me know if this has 
come up before, and if so, please accept my sincere apologies.

Slytherin wanted to get rid of anyone who wasn't "pure-blood." 
However, as I understand it, Tom Riddle (Voldemort) was only half-
blood as his mom was a witch and his dad was a muggle. Is this an 
inconsistency? Is he really the heir of Slytherin? Also, if the 
basilisk is trained to kill "mudbloods," isn't his "blood" kind 
of "muddy?" Why should it listen to him?

Just a thought...

Callie603