I currently have a 50/50 agreement with my Ex for our daughter who has recently turned 3. She wants to put her in a early learning center and therefore wants to modify the agreement to 4 weeks 2 weeks instead of the previous 2 weeks 2 weeks. Is she allowed to do this? Ive also received a letter in the mail yesterday from her lawyer saying that I must respond in 10 days or they will take it to court. What are my options?