Acts 11:11,12

“And behold, forthwith three men stood before the house in which we were, having been sent from Caesarea to me, and the Spirit bade me go with them, making no distinction. And these six brethren also accompanied me, and we entered into the man's house.”

Then he described how three men had arrived who had been sent from Caesarea by Cornelius, and  how the Spirit had bade him go with them, and not to make a distinction because they were Gentiles.

After which, indicating the six Christian Jews who had been with him, he stated, ‘these six brethren also accompanied me and we entered into their house.' So he had not been alone in his decision. There had been unity of thought among these Jewish Christian leaders, and they had all agreed that they should enter the house. And including himself that meant that there had been seven of them, the perfect number to make any such decision. Compare the sevenfold seals of witness on important documents of the time (see Revelation 5:1). We note here the emphasis on unity of thought and united action. Peter claimed no unique authority for himself. He had depended on the combined decision of the seven.

‘In which we were', referring to Simon's house, need not involve the six, it may simply mean ‘myself and Simon'. There is no suggestion that the six were also staying with Simon the Tanner.