Can a lawyer take an unrelated case against the spouse of a former client, when the spouse was not the lawyer's client?
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This page answers the general question as of 1986. Ezel answers yours: whether it's allowed on your facts, under the current Illinois Rules of Professional Conduct, with citations.
Plain-English summary
The inquiring lawyer had represented A, the respondent in a dissolution proceeding. Months later, B asked the lawyer to represent him in a personal injury suit against A's wife, who had been A's girlfriend during the earlier representation. The committee was asked whether the lawyer could accept an unrelated matter against the spouse of a former client.
The committee found no provision of the Code that would specifically bar such a representation. It noted that the many opinions on representation adverse to a former client supply relevant considerations, but that those considerations are less likely to make the representation improper where the new matter is against a relative of the former client rather than the former client directly. The committee then set out two limits. First, under former Rule 4-101(b), the lawyer may not undertake the representation if he might be tempted or required to use a confidence or secret of the former client to that client's disadvantage or for another's advantage, absent consent. Second, under former Rule 5-105(a), the lawyer must have no doubt about his ability to exercise independent professional judgment for the new client; if the former representation would interfere with that judgment in any way, the new representation would be improper.
Subject to those considerations, the committee concluded the proposed representation would be proper.
Currency note
This opinion was issued in January 1986, under the former Illinois Code of Professional Responsibility and before Illinois adopted the 1990 (and later 2010) Rules of Professional Conduct. The ISBA Board of Governors affirmed the opinion in July 2010 as generally consistent with the 2010 Rules (Rules 1.6(a), 1.8, and 1.9), while cautioning that the specific standards referenced may differ from the 2010 Rules. Subsequent rule amendments or later opinions may have changed the analysis. Treat this page as historical context, not current guidance. Verify against current rules before relying on any specific rule or requirement mentioned here.
Common questions
Q: Can a lawyer sue the spouse of a former client in an unrelated case?
A: The opinion concluded yes; the committee found no per se bar, and noted the concern is weaker when the new matter is against a relative of the former client rather than the former client directly.
Q: What confidentiality limit applies?
A: Per the opinion, under former Rule 4-101(b) the lawyer may not take the matter if he might be tempted or required to use a former client's confidence or secret to that client's disadvantage or another's advantage without consent.
Q: What other condition did the committee require?
A: The lawyer must have no doubt about his ability to exercise independent professional judgment for the new client under former Rule 5-105(a); if the prior representation would interfere, the new matter would be improper.
Background and rules framework
The opinion applied former Illinois Code Rule 4-101(b) (use of a former client's confidences and secrets) and Rule 5-105(a) (independent professional judgment). The Board's 2010 affirmation maps the analysis to current Illinois Rules of Professional Conduct 1.6(a) (confidentiality), 1.8 (specific conflicts), and 1.9 (duties to former clients), corresponding to ABA Model Rules 1.6, 1.8, and 1.9.
Citations and references
Rules of Professional Conduct:
- Illinois Code Rule 4-101(b) (former client's confidences, applied in the opinion)
- Illinois Code Rule 5-105(a) (independent professional judgment)
- Illinois RPC 1.6(a), 1.8, 1.9 (2010 equivalents per the Board's affirmation)
- MR 1.6 (confidentiality); MR 1.8 (specific conflicts); MR 1.9 (former clients)
Other opinions cited:
- ISBA Opinions 753, 644, 581, 569: representation adverse to a former client
- ABA Informal Opinion 1322
See also
- ISBA Ethics Op. 86-17: Duties Run to the Client Only
- ISBA Ethics Op. 88-07: Suing a Former Village Client
- ISBA Ethics Op. 05-01: Cross-Examining a Former Client
Source
- Landing page: https://www.isba.org/ethics/opinions/8511
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