First, the link disclosures are not a written requirement.
Second, they are a best practice so the user knows that they are leaving your site, other privacy policies may apply and there may be different rules for data gathering, cookies, products and services, etc.
Because these affiliates may differ, I'd keep the link disclosures in place. If you have one webmaster and all three sites are in sync, rule wise, you may choose not to use them.
If it were me, I'd add them and move on. They aren't that big a deal to add.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell