Father was a USA citizen. He retired to Mexico and lived there for about 15 years. He had a will/trust drawn up in California where he owned quite a bit of real estate. He also owned quite a few properties in Mexico. He passed away in California. If the will/trust are not "favorable" to my brother and myself (we live in the United States), can it be successfully challenged from Mexico? He was a resident there and does not have a Mexican will or trust.If you need more info let me know.