Silly one but my ex has started sending me money for the kids, this is the first time he's ever done it as he previously told me he should NOT have to pay any maintenance, he just started doing this of his own accord out of nowhere. He texts me to tell me he has sent money, am I suppose to respond each time? I did the first time but am I meant to respond each time going forward? as I said he has never done this before so I don’t know what the “etiquette” is, we don’t speak otherwise. Obviously im not going to say thanks but do I send a message to acknowledge the payment each time?