Passage
and to the sister Apphia and to Archippus our fellow-soldier, and to the assembly which [is] in thine house.
and to the sister Apphia and to Archippus our fellow-soldier, and to the assembly which [is] in thine house.
Philemon 1:1 Paul, prisoner of Christ Jesus, and Timotheus the brother, to Philemon the beloved and our fellow-workman,
Philemon 1:2 and to the sister Apphia and to Archippus our fellow-soldier, and to the assembly which [is] in thine house.
Philemon 1:3 Grace to you and peace from God our Father, and [the] Lord Jesus Christ.
Philemon 1:4 I thank my God, always making mention of thee at my prayers,
The verse centers on "sister", "apphia", "archippus", "fellow-soldier", "assembly", "thine", and "house". It is saying that the verse draws attention to "sister" and "apphia", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 1's "Paul prisoner of Christ Jesus and Timotheus..." into verse 3's "Grace to you and peace from God...", so "sister" and "apphia" belong inside that flow. In Philemon context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "sister" and "apphia" with trust shaped by these words, not by a vague optimism outside the passage.