What does Winston remember about his parents?

From the text:

He must, he thought, have been ten or eleven years old when his mother had disappeared. She was a tall, statuesque, rather silent woman with slow movements and magnificent fair hair. His father he remembered more vaguely as dark and thin, dressed always in neat dark clothes (Winston remembered especially the very thin soles of his father’s shoes) and wearing spectacles. The two of them must evidently have been swallowed up in one of the first great purges of the fifties.