Father/Daughter Same Household MULTIBOXING?

ok i am in a game with two individuals. one of them admitted to me she is the daughter of another player. and by her grammar and sentence structure she is rather young. they login at the same time even in the middle of the night. they plan attacks within 1-2 minutes of each other in succession so dad goes first then daughter follows within a minute. they even expanded to be next to each other.
is this considered multiboxing. he is clearly playing both accounts to have an unfair advantage. both of them attack in the same way etc. i have an entire list of similarities that show they act as one. its two accounts working as one.
now im not salty im about to pull off a * combo and crush him then his daughter. i alraedy repelled 300 of his and his daughters troops and not lost any ground. he is very newb. so im not posting this to get the game ended quite frankly i want to crush him and his daughter to show how pathetic he is needing two accounts and still cant win
is this considered multiboxing. he is clearly playing both accounts to have an unfair advantage. both of them attack in the same way etc. i have an entire list of similarities that show they act as one. its two accounts working as one.
now im not salty im about to pull off a * combo and crush him then his daughter. i alraedy repelled 300 of his and his daughters troops and not lost any ground. he is very newb. so im not posting this to get the game ended quite frankly i want to crush him and his daughter to show how pathetic he is needing two accounts and still cant win