for his help to / for helping

0... thanked John for his help in arresting the their. or ... thanked John for his help that led to the arrest of the thief.02br
02br
00(b) - The owner of the car didn't arrest the thief. This sentence is illogical. You can say: The owner of the car thanked 01b00the02b00 two policemen and John for their help.0-

0for (b), I'm trying to say that, "the owner of the car thanked policemen and John for their help (because they help to arrest the thief), So, I continue to say, "....for their help to arrest the thief." Is that a wrong way to say?02br
02br
00IS there a incorrect to say, " thanked John for helping him to arrest the thief" ?0-

0The problem is not with the grammar, it's with the logic.02br
02br
00The POLICE (not the owner) arrest the thief. The OWNER can thank the police for arresting the thief, but not for their HELP in arresting the thief. If you say the owner thanked the police for helping him arrest the thief, it sounds like the owner arrested the theirf.0-

0That means, if I change them to this way,02br
02br
00Aren't natural and logic to say,02br
02br
00(a) The owner of the car and the policemen thanked John FOR helping the police (them)to arrest the thieves.02br
02br
00(b) The owner of the car thanked John for helping the police (them) to arrest the thieves. 02br
02br
00

0Dear grammar greek, or any other experts,can anyone giveme some comments? 02br
02br
01a02a0-

1font00(a) The owner of the car and the policemen thanked John FOR helping the police (them)to arrest the thieves. 01font02font02font00Okay - I assume you don't mean to actually write the word "them." I usually do not use the "to" after help. Just "For helping the police arrest the thieves." This sounds like John was m