It did not come as a surprise that Isabella had never told her son about his father Heathcliff; young Linton didnt even know he had a father.
The generally dark atmosphere in Wuthering Heights did not make Linton very comfortable. He couldnt even eat the food Joseph gave him, the same food Hareton ate as a child. Joseph sneered, seeing Isabellas resemblance there, but Heathcliff actually told him to make the kind of food Linton was accustomed to.
Linton never wanted to stay at Wuthering Heights, so Ellen had to sneak out to leave. He saw her anyway and gave a cry, but she knew there was nothing she could do.