DHK said:
Do some study on this particular epistle. Just as Paul's epistle to Philemon was not written to a church, neither is this epistle written to a church.
What is the source of your information?
From the ISBE
PHILEMON
<fi-le’-mon>, <fi-le’-mun> ([Filh>mwn, Philemon]): Among the converts
of Paul, perhaps while at Ephesus, was one whom he calls a “fellowworker,”
Philemon (Philem 1:1). He was probably a man of some means,
was celebrated for his hospitality (Philem 1:5-7) and of considerable
importance in the ecclesia at Colosse. It was at his house (Philem 1:2) that
the Colossian Christians met as a center. It is more than probable that this
was a group of the Colossian church rather than the entire ecclesia.
Robertson's Word Pictures In The NT
To the church in thy house (têi kat' oikon sou ekklêsiâi). The church that met in the house of Philemon. In large cities there would be several meeting-places. Before the third century there is no certain evidence of special church buildings for worship (White, Exp. Grk. T.).
Louw & Nida
7.2: oikos" {a} , ou m : a building consisting of one or more rooms and normally serving as a dwelling place ( oikos{a} also includes
certain public buildings, for example, a temple) - `house, temple, sanctuary.' (The extension of oikos {a} to include temples may be the
result of speaking of a temple as the dwelling place of the deity.) hjkouvsqh o{ti ejn oi[kw'/ ejstivn `it was reported that he was at home'
#Mark 2:1 ; {Footnote 8073} tou' ajpolomevnou metaxuV tou' qusiasthrivou kaiV tou' oi[kou `who perished between the altar and the
Temple' #Luke 11:51 . For a discussion of certain translational problems related to oikos" {a} , see 7.3. 557
Clarke's Commentary
That Philemon was a person of some consideration in his own city, and in
the Church in that place, is very evident from this epistle. He had a
Church in his house, Philemon 1:2, and was so opulent as to be
extensive in works of charity, and in entertaining those Christians who
from different quarters had occasion to visit Colosse. See Philemon
1:5-7.
Matthew Henry
2. The persons written to are Philemon and Apphia, and with them
Archippus,
and the church in Philemon's house. Philemon, the master of
Onesimus, was the principal, to whom the letter is inscribed, the head of
the family, in whom were the authority and power of taking in or shutting
out, and whose property Onesimus was: with him therefore chiefly lay the
business.
JFB
church in thy house — In the absence of a regular church building, the
houses of particular saints were used for that purpose. Observe Paul’s tact
in associating with Philemon those associated by kindred or Christian
brotherhood with his house, and not going beyond it.
Philemon 1:1-3
NASU
"Paul, a prisoner of Christ Jesus, and Timothy our brother, to Philemon our beloved [brother] and fellow worker, and to Apphia our sister, and to Archippus our fellow soldier,
and to the church in your house: Grace to you and peace from God our Father and the Lord Jesus Christ."
Darby's Translation
Paul, prisoner of Christ Jesus, and Timotheus the brother, to Philemon the beloved and our fellow-workman, and to the sister Apphia and to Archippus our fellow-soldier,
and to the assembly which is in thine house. Grace to you and peace from God our Father, and the Lord Jesus Christ."
KJV
Paul, a prisoner of Jesus Christ, and Timothy our brother, unto Philemon our dearly beloved, and fellowlabourer, 2 And to our beloved Apphia, and Archippus our fellowsoldier,
and to the church in thy house: 3 Grace to you, and peace, from God our Father and the Lord Jesus Christ."
NIV
Paul, a prisoner of Christ Jesus, and Timothy our brother, To Philemon our dear friend and fellow worker, to Apphia our sister, to Archippus our fellow soldier and to
the church that meets in your home: Grace to you and peace from God our Father and the Lord Jesus Christ.
RSV
Paul, a prisoner for Christ Jesus, and Timothy our brother, To Phile'mon our beloved fellow worker and Ap'phia our sister and Archip'pus our fellow soldier, and the church in your house: Grace to you and peace from God our Father and the Lord Jesus Christ.
Young's
Paul, a prisoner of Christ Jesus, and Timotheus the brother, to Philemon our beloved and fellow-worker, and Apphia the beloved, and Archippus our fellow-soldier,
and the assembly in thy house: Grace to you, and peace, from God our Father, and the Lord Jesus Christ!