Colossians 3:13–14 gives the structure that makes any difficult relational community workable: forbearance, forgiveness, and above all love, which "is the bond of perfectness." The Greek word for "bond" — syndesmos — means a ligament, the tissue that holds the body together. In a blended family, the natural biological ligaments that hold family structure together are often absent or complicated. What holds it together instead is the practiced, chosen love that Paul describes here — not sentiment but the daily decision to bear with, to forgive, to remain.
Psalm 68:6 contains a statement that applies directly to non-traditional family formation: "God setteth the solitary in families." The Hebrew word for "setteth" — moshib — means to cause to dwell, to establish. God is actively involved in the construction of family out of people who are alone or displaced. This does not make blended families frictionless. But it does mean the construction is not accidental.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.