After no reply after 24 hours, you should have called the CO, game warden or whatever they're called in your area. Explain and show him your blood proof and he may have let you on their property. Some states have laws where people ARE allowed to go onto private property to search for a wounded deer.
Have your son be proud. He got a deer. Congratulations! The only thing is that an idiotic land owner didn't let him access property to retrieve it. Your son should keep hunting and enjoy the rest of the season.
I WOULD press charges for the trespassing. It's obvious the neighbor kids have no respect for you... none at all. You will have to show them a valuable lesson in life, that there are consequences to our actions. It's your decision, but I feel responsibility to call the authorities and press charges.
If you don't press charges, then your post here is just an empty rant. Follow through on what's right. Kids that disrespect the laws here are often the ones who grow up doing more of the same. If they get a trespassing ticket by having to go to court, maybe they'll step back and consider their actions as being wrong... something they can learn by.
And further, the father is also exuding a big lack of respect for you because he hasn't even shown any consideration for you or your son to let you on his property.
Press charges.
iSnipe