The trespasser

On our last holiday, Tom (my husband) said something and woke me up (near noon).
I changed my clothes and looked in the yard. I saw some police officers and him there.

Tom explained to the officers that 30 minutes ago, when he was surfing websites at the dining-room table, a squarely built white-haired man, came through the yard from side to side and tried to open the kitchen door, "chonk! chonk!" . As soon as the guy saw the door was locked, he headed to the next door(it is the garage door in the back porch.)
Of course Tom was scared of the intruder. He couldn't have guessed someone could walk in the yard, excluding us, cats or birds, because the rear gate of the yard had a chain with a dial key.
Tom opened the kitchen door at speed and bellowed out what on earth the guy was doing.
The man asked "is this house yours?" and turned back into the yard.
Tom still had his pajamas on, so he scrambled to return to the room to change into his trousers, then he ran after the man at full gallop and told the man that he would call the police.
The guy yelled back that "you can call the police!".
Tom realized he didn't have his cellphone, so he turned back to the dining-room and popped out through the front door in great haste.
Though the guy disappeared Tom phoned the police.
Tom said there was a name written with a felt pen on the guy's white Boston bag .
When I heared the name, I flashed on what my mother had said. Before, she had told me that she had been annoyed an old man who had got a little senile for several years, so I said we would be able to say who the guy was if we asked my mother.
My mother said the man was like a house stalker. Without even a glance at people and other houses, the man made him get into this house.

On the first time, Mother asked him why he opened the door of her house, and asked him to show his ID. When he showed his senior's bus pass, Mom realized that he had got senile and remembered the name on the pass. After that, the guy soon left straightforwardly and Mom asked the city office who he was and also where he lived; a relief facility(I think it is a kind of rescue home) for people who are very poor, handicapped or sometimes released from jail.
Mother told the institution several times and the police twice, and put a latch on the yard gate, but the guy still sometimes appeared. At one time she found he had taken her stepladder from the garage and put it on the second floor balcony.

However, this time, the police found the chain chopped off with a tool near the gate. They caught the suspect on his way home and found a wire cutter in his Boston bag. They caught him and asked Tom to write a declaration which took all day! The man likely made an open confession but it was incoherent.
We don't know if he hid something or got completely senile, but we hope he won't appear again, above all from the back door!