I have cable, but the cable box is in only one TV, my question is, do I need converters in the others TV in the house?

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Entirely dependent on you local cable provider's policies.

The February 2009 analog broadcast cutoff in the United States only affects televisions that are dependent on antennas to receive signals directly from local television broadcasters. That particular government action doesn't affect the availability of analog channels on cable television systems.

The converters eligible for the government coupon are only usable for digital broadcast signals received with an antenna. Those particular converters are of no use converting signals from a cable company or satellite dish.

Like other programming on digital satellite systems (like Dish Network and Direct TV) local stations distributed through the satellite are already in a digital format. Some home satellite installations include a second antenna that receives local stations directly from the local broadcaster though.

Analog channels require more resources on cable systems than standard definition digital channels. Some cable providers have been duplicating analog channels in digital format so that customers with digital converters can enjoy better picture quality. In some cases the cable providers phase out the analog duplicates to make room for a larger quantity of digital channels. Many cable subscribers should expect the quantity of channels available to analog to shrink significantly (or completely) in the next few years. For analog only TVs the subscriber will probably need to rent a converter from the cable provider for each TV. Even digital cable ready TVs will probably require rental equipment to receive channels beyond the local broadcasters and a few community access channels.

You mean splitter... you you do.. a splitter has one input and two or more outputs to enabel you to connect more TV's... too many outputs may degrade your signal quality.. few TV's may not affect your received signal.

Good luck

Unless the original poster is planning to watch the same channel on the additional TVs a splitter might not be enough to use the other TVs. On many cable systems many of the in the clear analog channels are gone or soon to be discontinued. Once that happens those additional TVs won't be able to use the encrypted digital channels without their own rental converter (unless they are a late model digital TV with a QAM tuner and a rental Cable Card). Read the last paragraph of my earlier post again.