Vad du beskriver är definitivt den brittiska tv-serien "The Clifton House Mystery". Kolla om det på Wikipedia eller YouTube, som har alla dess episoder.
The plot revolves around concert pianist Timothy Clare and his family - a daughter and two sons - moving into an old house in Bristol they had just bought from the elderly Mrs Betterton; the house having been in her family for generations. While exploring the garden, Timothy's two sons notice that the house has an extra window, and deduce that a hidden room may exist. After breaking through an upstairs wall and discovering an ancient dusty bedroom, a long-dead skeleton is found in the four-poster bed.
A number of strange incidents then start to occur. The Clares' daughter Jenny is visited by the ghost of a kindly old woman who appears to be summoned by a music box left behind by Mrs Betterton's granddaughter. Plates and bowls jump out of people's hands and smash to the ground. A dragoon's helmet that the boys had bought at Mrs Betterton's contents auction starts to glow mysteriously; and a blood-like liquid drips through the ceiling onto some dinner party guests.
After these unexplained incidents, the boys recruit a local ghost hunter called Milton Guest to investigate. After hearing what has happened, Guest becomes convinced that a ghost connected in some way with the Bristol Riots of 1831 is haunting the house. After checking local records, they realize that it may be the ghost of a dragoon commander called George Bretherton who was court-martialled for his lenient handling of the rioters, and who subsequently disappeared without trace.