wolfheart said:I have a player in my campaign who is playing a druid and wants to pick up levels of sorcerer. He has an owl as an animal companion, and wants this owl to become his familiar also. How would you handle this?
Only a normal, unmodified animal may become a familiar. Thus, a druid/sorcerer can't use her animal companion as a familiar.
wolfheart said:I have a player in my campaign who is playing a druid and wants to pick up levels of sorcerer. He has an owl as an animal companion, and wants this owl to become his familiar also. How would you handle this?
Thanks in advance
Perun said:If you go by the rules, he cannot do it.
From the 3.5 PHB, p. 52 (Familiar sidebar):

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.