There are rules about the number of pages , you need to be more concise, especially for an objection. Perhaps submit your own statement of decision if the other side didnt prepare it properly. But know what a statement of decision is and is not. Its the Courts decision put into written form, its not the opportunity to re-argue the case. If the other side has an attorney, try talking to them but be concise. Its hard to imagine your ovjection is more than 10 pages.
Short answer, yes and yes., further, domestic violence findings may affect a custody decision.
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A domestic violence restraining order is between two people in a dating or former dating relationship. The only way the parents can get such a restraining order is to act as his guardian ad litem. This is problematic since he is going to be 18 in 3 mos and opposes the restraining order. These orders are form3 to 5 yrs, I dont think a judge will want to make such an order.
I suspect this has to do with the the ages of you both and possibility he can get into trouble.