They will almost certainly eat the young. At least for the first few months. I'm trying to increase my chances by obtaining 50% wild fish. Some people think the instinct to raise their young is 'bred out' of them by artificial raising. I'm not so sure the fish just don't get nervous in our less than natural setups. A large enough, well planted enough tank with water parameters close to what they're used to will probably help. Still, parent raised angels are very unusual in this country.
The other thing is that angels breed best at 80-84 degrees F. You'll need to watch the plant selection at those temps.