It is absolutely common for a family to have a dispute.

Streiten will gelernt sein

And it is perfectly normal for the argument to endure. However, it is smart to choose a suitable process for its settlement. One option is to sue, but there are other possibilities. Consensus-oriented approaches are often advantageous because they save money and allow for more sustainable solutions.
Think of collaborative law as a mediation without a mediator. Both parties agree to a completely extrajudicial process in which the parties’ lawyers provide legal advice and also manage the process.

The unique characteristic of collaborative law is the disqualification agreement.

The disqualification agreement is a clause that bans the parties’ lawyers from participating in a court process. Should either party decide to sue, then both parties would have to hire new lawyers to handle the litigation. At first sight, this looks like a questionable restriction of the retainer agreement. But it indeed makes sense: by signing the disqualification agreement, the parties make an impressive pledge of their commitment to a consensual settlement. Collaborative law presupposes a mutual pledge of this kind – and this has proven to be effective. Surveys show a settlement rate of up to 95% for negotiations conducted through collaborative law.