Why would you want to join the SSPX? Recently, I went through a thing where I thought it might be interesting to join the SSPX and I even contacted them and all that, but in the end, remember that at the moment, they have no Canonical standing within the Church. If you wish to attend SSPX Masses because you desire the TLM, that is fine, but more than that, I would not do. Their Absolutions are to the best of my knowledge, except in grave situations, invalid because they lack Ordinary jurisdiction.
(even though I think there are many good things about them otherwise.)
fully Catholic and in good standing with the Church, AND traditional! 
Would you do us a favor and edit this paragraph. One could easily mistake what you’ve written and fear to attend any EF Mass. And we all know the EF Mass is entirely legal and valid.
What does that have to do with the SSPX? If you want to discuss this question, please start another thread. When things get off-topic they can be edited or removed by the moderators so as not to derail the thread.
You’re asking the wrong people. SSPXrs generally don’t come to Catholic Answers. The SSPX is in talks with the Vatican to become regularized with the Church. Until the time when that happens (and many, including myself, are praying that it does), obedient Catholics who are drawn to traditional forms are urged to seek out groups in full communion with the Church, such as the FSSP and ICKSP.
The fourth commandment is to honor your father and mother. So you should always do so. Now, honoring them does not necessarily mean obeying them if they order you to sin. If my father tells me to kill someone, and I disobey, that does not mean I am dishonoring my father.
Just show up for mass and when you are ready fill out the paper to get on the chapel register.
There are one or two of us here. As was stated, one does not join the SSPX, except perhaps as a tertiary. You just simply assist at Mass at an SSPX chapel if you choose. There are some SSPX-friendly boards you could check out. PM me if you want the addresses.
I was afraid this topic would provoke someone to fire a shot at the Catholic Church. I am somewhat surprised this was done with a poster’s very first post. Just to clarify, the opinion expressed here is from the point of view of the SSPX, not the Catholic Church. The status of the SSPX is a result of actions taken on part of the SSPX leadership. I understand they deemed their actions necessary to their way of thinking, but that does not shift the responisbility for their actions. Even a child can not assert their autonomy then try to shift responsibility.
Not sure about the OP but my answer is: