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The best way to protect yourself and to protect the company is to have them sign the same Confidentiality and Inventions Assignment Agreement that I sent to you for use with the web designer you are using.
Although they are offering "gratuitous advice," by having them sign the agreement before discussing the company with you they cannot make a claim to ownership of the ideas that you have used with the company.
You may want to shorten the agreement and distill it down to its essence for informal discussions such as this, but it would be to your benefit to do so.
Good luck to you. I wish you all the best.