Ok, I suggest that you wait for the refusal letter. This will tell you why the visa has been refused. Once you have read the refusal letter you can contact me again if anything is not clear.
With respect to your second question, if your son's wife's spouse visa is issued this will give her 2 years leave to remain in the UK (this is called the probationary period). At the end of this period she will need to apply for settlement in the UK (this is called indefinite leave to remain). The former does not automatically lead to the latter. It requires a new application and certain requirements have to be met. For example, the marriage must still be subsisting and the parties must intend to live to together permanently as husband and wife. However, so long as your son and his wife are still together then they shouldn't have any problem in meeting the requirements.
I hope this answers your question. Please kindly click the green ACCEPT button so that I may be compensated for my time. Thank-you.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).