Pianos have massive amounts of string tension. Their construction is such that they acclimate to whatever string tension is present in order to be stable. This is what makes them both a solid piece of furniture and a musical instrument.
However, the tuning of every stringed instrument, including pianos, slips and becomes flat over time. Occasional re-tuning by a professional technician are part of the cost of owning a piano.
If you have a teenage child who is musically talented in some way — such as if they are a singer, a guitarist, or both — then it might be worth it to work with a clean country music songwriter, particularly if it's country music that they have an interest in. It's worth it to work with one of these professionals for these reasons and more.
Costs Might Not Be as High as You Think