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After the elapse of a period of time, nobody much cares if the reason you only had every other weekend was because the other parent truly wouldn’t “let” you have more time. Although that may very well be the case, and although you may have let your spouse control the situation in order to spare the children the trauma of parental conflict, in my experience the courts are more swayed by the pattern of contact rather than by these “excuses.” The wisdom of Solomon does not apply. 
For married parties with children born during the marriage, both parties have joint legal and physical custody until the Court orders otherwise. Thus, either parent has the right to take the children, and the other parent has the right to take them back, and so forth. This can lead to a lot of game-playing and tugs-o-war which are obviously harmful to the children.
Under both Minnesota law,  and federal law,  as long as you yourself are a party to the conversation, it is lawful for you to record that conversation, even secretly. Furthermore, such recordings happen often enough in family practice that you are wise to assume that any telephone conversation with your spouse is in fact being recorded, and to temper your speech accordingly — i.e., no anger, name-calling, or spiteful speech of any kind.
NOTE: There are many ways to divide real estate in a divorce. The court forms for marriage dissolution (divorce) only give you 1 option -- one spouse gets 100% of the house, cabin, or other real estate, and the other spouse gets a lien. But, you can change the court forms. An attorney can explain other options, advise you about the law, and draft terms to meet your situation. If your divorce involves real estate, you should get advice from a lawyer on your legal rights and options.