Hi Kerry and welcome to the forum
So long as you have all of your information readily to hand - such as creditor statements of account, loan agreements, wageslips, property rental agreement, council tax account, property valuation, mortgage redemption statement, HP agreements and anything else relative to your case, and IVA should be able to be set up within 4-6 weeks of you seeking advice from an IP.
You will need to disclose your family debts to the IP, but if they decide not to be included then they can be left out - but you will not be able to repay them any money in the future.
With regard to the joint debt, if you enter into an IVA the creditor is likely to pursue your mother directly, and if she is continuing to make the payment in any case this should not be a problem.
Regards, Melanie Giles, Insolvency Practitioner