is this sentense right ?

[liuchunsheng123456]

Tom got his son waiting ourside of gate for three hours .
Does this sentence pattern " get somebody doing something " exist or not ?
Anyone's comment is welcomed here .

[Pete]

Tom got his son waiting ourside of gate for three hours .
Does this sentence pattern " get somebody doing something " exist or not ?
Anyone's comment is welcomed here .
I think there are several issues. First, the phrase "for 3 hours" changes the sense of "waiting" from what he was doing at the moment of the main action to what he had been doing for a while before. Thus, this definitely sounds wrong. I suggest:
- Tom got his son, who had been waiting outside of the gate for three hours.

Without that phrase showing duration, I still don't think it sounds natural, but I'm not sure why. This is assuming that by "got", you mean "picked up", "caused to accompany you". I'm not certain why in this sense it doesn't seem right to me; maybe because "got" has more to do with what happened after the "getting" than with what was going on at the time you made contact. I prefer,
- Tom got his son, who was waiting outside the gate.

If you are referring to taking a photograph, it would be natural:
- Did he take any pictures of his family? / Yes, Tom got his son waiting outside of the gate.

Certain other verbs seem very natural in this sort of sentence:
- The policeman caught the suspect climbing into the back window.
- I saw Pat shopping at Target's last night.
- I heard the dog barking.

[Rusty]

Tom got his son waiting ourside of gate for three hours .
Does this sentence pattern " get somebody doing something " exist or not ?
Anyone's comment is welcomed here .
I think there is another issue besides Pete's comments.
In the pattern "get somebody doing something," get can be a causative verb.
A more common pattern is "get somebody to do something." I think that "doing something" is the continuous infinitive verb without "to be," that is, "to be doing something." (Comments welcome).
Example: I got my son (to be) washing the car. I caused the action to happen.
The sentence "Tom got his son waiting outside the gate" sounds unusual. If Tom convinced his son to sit and wait there for something for three hours, the sentence would make sense.
A more likely example:
Tom got his son working at XXX Company because he was a friend of the the owner.

[liuchunsheng123456]

they are wonderful replies, thank very much .