Mark 1:29

And forthwith, when they were come out of the synagogue--so also in Luk 4:38. they entered into the house of Simon and Andrew, with James and John--The mention of these four--which is peculiar to Mark--is the first of those traces of Peter's hand in this Gospel, of which we shall find many more. The house being his, and the illness and cure so nearly affecting himself, it is interesting to observe this minute specification of the number and names of the witnesses; interesting also--as the first occasion on which the sacred triumvirate of Peter and James and John are selected from among the rest, to be a threefold cord of testimony to certain events in their Lord's life (see on Mar 5:37) --Andrew being present on this occasion, as the occurrence took place in his own house.

In these verses, we have, I. A particular account of one miracle that Christ wrought, in the cure of Peter's wife's mother, who was ill of a fever. This passage we had before, in Matthew. Observe, 1. When Christ had done that which spread his fame throughout all parts, he did not then sit still, as some think that they may lie in bed when their name is up. No, he continued to do good, for that was it he aimed at, and not his own honour. Nay, those who are in reputation, had need be busy and careful to keep it up. 2. When he came out of the synagogue, where he had taught and healed with a divine authority, yet he conversed familiarly with the poor fishermen that attended him, and did not think it below him. Let the same mind, the same lowly mind, be in us, that was in him. 3. He went into Peter's house, probably invited thither to such entertainment as a poor fisherman could give him, and he accepted of it. The apostles left all for Christ; so far as that what they had should not hinder them from him, yet not so, but that they might use it for him. 4. He cured his mother-in-law, who was sick. Wherever Christ comes, he comes to do good, and will be sure to pay richly for his entertainment. Observe, How complete the cure was; when the fever left her, it did not, as usual, leave her weak, but the same hand that healed her, strengthened her, so that she was able to minister to them; the cure is in order to that, to fit for action, that we may minister to Christ, and to those that are his for his sake. II. A general account of many cures he wrought - diseases healed, devils expelled. It was on the evening of the sabbath, when the sun did set, or was set; perhaps many scrupled bringing their sick to him, till the sabbath was over, but their weakness therein was no prejudice to…

1:29-30 Simon (Peter) was married (see 1 Cor 9:5).