What are my rights by law in Arkansas probate?

My in laws died with only my husband as their only heir. 4 months later my husband died while his parents estate was in probate so my lawyer probated my in laws property as my husbands inherited estate.

I was made administrator of his estate. My children are thinking they own part of the estate because the lawyer said in a letter that the estate ownership was vested in my name and all my children's names.

I paid the taxes for that year and have been paying taxes, insurance and upkeep since 1997 when my mother in law died. None of the children paid anything and I kept the house for sentimental reasons.

The house burned and now the kids are wanting the property.

What rights do I have and do they have any claim to this property?