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Spellbound says
No he didn't. He had three children by his two wives and at least two illegitimate children when he was an underground revolutionary. I can find no reference to him having a maid called Valentina, nor to him having a child by one of his household staff.
Legitimate children:
By 'Ekaterina (known as Kato) Svanidze – Yakov (known as Yasha)
By Nadezhda (known as Nadya) Aliluyeva – Vasily & Svetlana
Illegitimate children:
By Maria Kuzakova – Konstantin
By Lidia Pereprygina – Alexander
As far as I can discover, he never met these two children, but he did protect them and their mothers.
See:
Stalin, A Biography – Robert Service
Young Stalin – Simon Sebag Montefiore