Sometimes an animal's presence will actually endanger the other animals in your exhibit (e.g. snow leopard sons and fathers tend to fight to the death once the lad is grown) and usually I will adopt/release to the wild the first generation of children as often there are at least two sets of children from breeding pairs
With the family tree, maintaining viable breeding pairs is a bit more difficult, as long as the animals don't share the same mother they can breed together. Try and keep their 'name numbers' close together as well, just so they are around the same age and won't die before giving birth
Or you could just use the hacks...I personally don't, though I may use them in future especially as the money cheat was removed in MM2...:pinch:
On another note, be
very careful with wolves and african wild dogs! They have alpha breeding pairs...:wacko: