1) Intermarry 2) Keep close relations 3) Keep it in the family 4) Not go outside the family 5) Reproduce in kind 
• (v. t.) To breed in and in. See under Breed, v. i. • (v. t.) To produce or generate within.
In·breed' transitive verb [ imperfect & past participle Inbred ; present participle & verbal noun Inbreeding .] [ Confer Imbreed .] 1. To produce or generate within. Bp. Reynolds. « To inbreed and ch...