How can I tell if my son is inbred?!?

He don got a lump above his left eye, and he sometimes twitches n stutters when he talks, jus da odder night he don went an poo'd himself cuz his irritablbe bowels. He don poop like a squirell in Jewly. If you think im joikin i aint i got pictures of da little rascaL. ALSO what does inbred mean? The woman at the day care said she don want an inbred runnin round with all the other mutts. Thank for all yall help yall gotta..