Property Inheritance with Siblings: Deceased brother's wife giving us hard time selling the property

My father deceased and did not have a will for the house he owned. My mother is also deceased. Together, they had four children. I will like to refer to the four children as Apple, Orange, Grape and Lemon. Lemon is the youngest son and is also deceased. Lemon did not leave a will but leaves behind a wife and son. We are having problem with the his wife, pertaining to settlement or selling the property.

My understanding is that all four children inherits the property. Lemon deceased in 2010. Lately, we heard that my brother's (lemon) wife is remarried. Does she still have any right to the property or any shares of the property? Lemon's son is now 14 years old.

The property is in bad shape as no one is willing to buy or invest money. The three children are trying to sell the property or trying to settle some money to Lemon's wife but she is giving us a hard time. The property is in Penang, Malaysia.

Any help is appreciated. Thank you.

When your father died without will, the Letter of Administration (LA) will split the assets to his wife and children.
When Lemon died without a will, the Letter of Administration will further split the assets to his wife and child.

The three children are trying to sell the property or trying to settle some money to Lemon's wife but she is giving us a hard time.

The property can only be sold if all owners agree to sell.
As the property also belongs to Lemon's wife, she has every right to refuse to sell.
Can anybody force you to sell your car?  Sure cannot la.

She is not giving anybody a hard time.